Hi Artyom. With all due respect, we at Iconfinder encourage contact between our customers and designers. We never delete comments or correspondences about prospective work. The only time we would ever delete a comment is if it contains irrelevant spam (for Viagra, for instance), contains personal attacks, or otherwise offensive or disrespectful or illegal content.
Not only do we allow correspondence, we encourage it. Our mission is to help designers make a living doing what they love. What better way to do that than to help them get projects?